For me, I moved from 4.4 through 4.8 to 4.10 now, and might in future go to 4.11 (actually waiting for 4.12). I wanted to keep always the last generation/line of kernels, prior to my current one. So, if I want just to purge 4.4-line, I can do that by right clicking on 4.4, choose the respective option, and done. As far as I can see, the script does not do this.

In future, I want to add some handy features like "hiding this line", so I don't see anything from 4.4 anymore, for example. Small, handy things (or look for example that it shows the /boot size and the current kernel above the list, etc.)

But in the end, you can always ask such things as "Why do people use software manager instead of apt-get install?" or similar. Because people differ in taste and requirements. Same here, I think

kittykernel - a cat-friendly, custom kernel manager for Linux Mint and other Debian derivates. Take a look or two here: ReleasesGithub
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